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create table products ( product_id int, name varchar(64) ); insert into products values (1, 'Product 1'), (2, 'Product 2'); create table sales ( customer_id int, product_id int ); insert into sales values (1, 2), (1, 2), (1, 1), (2, 2), (2, 1), (2, 1); select customer_id, name, rank() over (partition by customer_id order by COUNT(product_id) DESC) from sales join products using (product_id)

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